Here is the points from vegan lifestyle. Your opinion matters
Anatomically we're herbivorous.,,
Humans have short, soft fingernails and small “canine” teeth. In contrast, carnivores all have sharp claws and large canine teeth that are capable of tearing flesh.
Carnivores’ jaws move only up and down, requiring them to tear chunks of flesh from their prey and swallow them whole. Humans and other herbivores can move their jaws up and down and from side to side, allowing them to grind up fruit and vegetables with their back teeth. Like other herbivores’ teeth, humans’ back molars are flat for grinding fibrous plant foods.
Dr. Richard Leakey, a renowned anthropologist, summarizes, “You can’t tear flesh by hand, you can’t tear hide by hand. Our anterior teeth are not suited for tearing flesh or hide. We don’t have large canine teeth, and we wouldn’t have been able to deal with food sources that require those large canines.”
Carnivorous animals swallow their food whole, relying on extremely acidic stomach juices to break down flesh and kill the dangerous bacteria in it, which would otherwise sicken or kill them. Our stomach acids are much weaker in comparison, because strong acids aren’t needed to digest prechewed fruits and vegetables. A wolf can eat over 20 lbs meat at one time and can go without food 12 days or more, equivalent to a human eat 5 days meal. Herbivorous stomach, like human, doesn't work that way, it can't stretch to contain a lot food at one time.
Animals who hunt have short intestinal tracts and colons that allow meat to pass through their bodies relatively quickly, before it can rot and cause illness. Humans’ intestinal tracts are much longer than those of carnivores of comparable size. Longer intestines allow the body more time to break down fiber and absorb the nutrients from plant-based foods, but they make it dangerous for humans to eat meat. The bacteria in meat have extra time to multiply during the long trip through the digestive system, increasing the risk of food poisoning. Meat actually begins to rot while it makes its way through human intestines, which increases the risk of developing colon cancer. 真的吗？吓S我了
If it’s so unhealthy and unnatural for humans to eat meat, why did our ancestors sometimes turn to flesh for sustenance? Author of the book The Power of Your Plate, Dr. Neal Barnard, talks about humans’ early diet, explaining that we “had diets very much like other great apes, which is to say a largely plant-based diet …. [M]eat-eating probably began by scavenging—eating the leftovers that carnivores had left behind. However, our bodies have never adapted to it. To this day, meat-eaters have a higher incidence of heart disease, cancer, diabetes, and other problems.”
Briana Pobiner, paleoanthropologist at the Smithsonian’s National Museum of Natural History, adds, “[F]ruit and different plants and other things that we may have eaten maybe became less available. . . . The meat-eating that we do, or that our ancestors did even back to the earliest time we were eating meat, is culturally mediated. You need some kind of processing technology in order to eat meat .… So I don’t necessarily think we are hardwired to eat meat.”
https://www.peta.org/living/food/really-natural-truth-humans-eating-meat/